A random ample of 79 light bulbs had a mean life of 400. The population standard deviation is known to be 28 hours. The 90% confidence interval for the mean life of all light bulb of this type is

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Urgent need asap △abc is similar to △xyz. also, side ab measures 6 cm, side bc measures 18 cm, and side xy measures 12 cm. what is the measure of side yz ? enter your answer in the box.

Ling is using fraction strips to add 2/3 and 7/12's the sum is one whole plus how many twelves?